?Optics and Modern Physics? of Understanding Physics series for JEE Main & Advanced serves as a standalone resource, encompassing all essential topics without any extraneous content. This book is designed with concise yet complete theory, coupled with an ample number of practice questions, ensuring an organised and structured approach to learning. With the inclusion of logical problems sourced from reputable resources like Irodov and question papers from previous years, this book will prove to be an indispensable companion for aspirants aiming for success in JEE.